Energy strategy for a heated greenhouse
Heat is the largest running cost in cold-climate production. Four decisions set it.
Insulation before capacity
A thermal screen, double glazing or PC cover cuts the load before the boiler is sized. Buying a bigger boiler to compensate for a leaky envelope is the most expensive route.
Temperature regime
Lowering the night set point by one or two degrees is a crop decision with an energy consequence. Decide it with the grower, not the boiler installer.
Heat source
Gas, heat pump, biomass, waste heat from a nearby plant. The comparison is on cost per kWh delivered, including connection and maintenance, not on efficiency alone.
Screens and control
A screen managed badly costs yield; managed well it pays for itself in two or three seasons in a cold climate.
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